Sea-air exchange patterns along the central and outer East Siberian Arctic Shelf as inferred from continuous CO2, stable isotope and bulk chemistry measurements

Christoph Humborg; Marc C. Geibel; Leif G. Anderson; Göran Björk; Carl-Magnus Mörth; Marcus Sundbom; Brett F. Thornton; Barbara Deutsch; Erik Gustafsson; Bo Gustafsson; Jörgen Ek; Igor P. Semiletov
2017 | Global Biogeochem Cycles | 31 (7) (1173-1193)

This large-scale quasi-synoptic study gives a comprehensive picture of sea-air CO2 fluxes during the melt season in the central and outer Laptev Sea (LS) and East Siberian Sea (ESS). During a 7 week cruise we compiled a continuous record of both surface water and air CO2 concentrations, in total 76,892 measurements. Overall, the central and outer parts of the ESAS constituted a sink for CO2, and we estimate a median uptake of 9.4 g C m−2 yr−1 or 6.6 Tg C yr−1. Our results suggest that while the ESS and shelf break waters adjacent to the LS and ESS are net autotrophic systems, the LS is a net heterotrophic system. CO2 sea-air fluxes for the LS were 4.7 g C m−2 yr−1, and for the ESS we estimate an uptake of 7.2 g C m−2 yr−1. Isotopic composition of dissolved inorganic carbon (δ13CDIC and δ13CCO2) in the water column indicates that the LS is depleted in δ13CDIC compared to the Arctic Ocean (ArcO) and ESS with an offset of 0.5‰ which can be explained by mixing of δ13CDIC-depleted riverine waters and 4.0 Tg yr−1 respiration of OCter; only a minor part (0.72 Tg yr−1) of this respired OCter is exchanged with the atmosphere. Property-mixing diagrams of total organic carbon and isotope ratio (δ13CSPE-DOC) versus dissolved organic carbon (DOC) concentration diagram indicate conservative and nonconservative mixing in the LS and ESS, respectively. We suggest land-derived particulate organic carbon from coastal erosion as an additional significant source for the depleted δ13CDIC.

Export of calcium carbonate corrosive waters from the East Siberian Sea

Leif G. Anderson; Jörgen Ek; Ylva Ericson; Christoph Humborg; Igor Semiletov; Marcus Sundbom; Adam Ulfsbo
2017 | Biogeosciences | 14 (1811-1823)
acidification , arctic-ocean , carbon cycle , SWERUS

The Siberian shelf seas are areas of extensive biogeochemical transformation of organic matter, both of marine and terrestrial origin. This in combination with brine production from sea ice formation results in a cold bottom water of relative high salinity and partial pressure of carbon dioxide (pCO2). Data from the SWERUS-C3 expedition compiled on the icebreaker Oden in July to September 2014 show the distribution of such waters at the outer shelf, as well as their export into the deep central Arctic basins. Very high pCO2 water, up to ∼ 1000 µatm, was observed associated with high nutrients and low oxygen concentrations. Consequently, this water had low saturation state with respect to calcium carbonate down to less than 0.8 for calcite and 0.5 for aragonite. Waters undersaturated in aragonite were also observed in the surface in waters at equilibrium with atmospheric CO2; however, at these conditions the cause of under-saturation was low salinity from river runoff and/or sea ice melt. The calcium carbonate corrosive water was observed all along the continental margin and well out into the deep Makarov and Canada basins at a depth from about 50 m depth in the west to about 150 m in the east. These waters of low aragonite saturation state are traced in historic data to the Canada Basin and in the waters flowing out of the Arctic Ocean north of Greenland and in the western Fram Strait, thus potentially impacting the marine life in the North Atlantic Ocean.

Kemiska analyser i vatten och sediment och biologiska tester av sediment i anslutning till båttvätt i Wasahamnen och jämförelse med Bullandö marina, Säck naturhamn och referensstation i Klagsfjärden.

2007 | Report No: Rapport till Stockho

Light degradation of pyoverdine produced by Pseudomonas fluorescens, consequences for metal mobilisation

Edberg, F.; Kalinowski, B. E.; Börjesson, S.; Holm, K.; Ek, J.

11th international symposium on Microbial Ecology - ISME-11 | September 19, 2019

Analys av metaller i anslutning till båttvätt i Trosa hamn. Rapport till Naturvårdsverket och Trosa kommun

Eklund, B. Holm, K., Ek, J.

Mobilization of metals from uranium ore in presence of pyoverdine at different light conditions

Edberg, F.; Kalinowski, B. E.; Börjesson, S.; Holm, K.; Ek, J.

Current development in remediation of contaminated lands, workshop, Pulawy, Poland | September 19, 2019

Mobilization of metals from uranium ore in presence of pyoverdine at different light conditions

Edberg, F.; Kalinowski, B. E.; Börjesson, S.; Holm, K.; Ek, J.

Workshop on Current Developments in Remediation of Contaminated Lands. Pulaway, Poland | September 19, 2019

Analys av metaller och närsalter I anslutning till båttvätt I Trosa hamn.

Eklund, B.; Holm, K; Ek, J.

Influence of acidification and liming on the distribution of trace elements in surface waters.

Borg, H.; Ek, J. & Holm
2001 | Wat. Air Soil Pollut. | 130 (1757-1762)
acidification , lakes , liming , metals , sweden

Influence of acidification and liming on the distribution of trace elements in surface waters

Borg, H.; Ek, J. & Holm

6th International Conference on Acidic Deposition, Acid Rain 2000

acidification , lakes , liming , metals , sweden

Toxicity of zinc run-off wastewaters to the green microalga Raphidocelis subcapitata (Selenastrum capricornutum).

Bengtsson, B-E.; Horg, H.; Ek, J.; Ek, K.; Fröberg, E.; Göthberg, A.; Hjalmarsson, C.; Johansson, C. & Kukulska

Styrfaktorer för metaller i vatten och “bäckvattenväxter” i små vattendrag i Kalmar län.

Lithner, G.; Carlsson, D.; Olsson, S.Å.; Ålind, P.; Andersson, M.; Ek, J.; Fröberg, E.; Korhonen, M.; Larsson, M.B. & Mäkinen
1993 | ITM, SU
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